thanks for coming on, ayman mohyeldin and john heilemann. coming up, that fight between mitt romney and rick perry is getting nasty, obviously, and it always was, personally. they're spending lots of money attacking each other and president obama must be loving watching this from afar. stand back and watch your opponents kill each other. you're watching "hardball," only on msnbc. ♪ [ mrs. davis ] i want to find a way to break through. to make science as exciting as a video game. i need to reach peter, who's falling behind. and push janet who's 6 chapters ahead. ♪ [ male announcer ] with interactive learning solutions from dell, mrs. davis can make education a little more personal. so every student feels like her only student.